Page 1
18
17
16
15
14
13
12
11
10
Output B
Output B
Rsense B
Rsense B
V+
V+
Rsense A
Rsense A
Output A
8170 Thompson Road Cicero, N.Y. 13039 (315) 699-9201
M.S.KENNEDY CORP.
ISO 9001 CERTIFIED BY DSCC
75 VOLT 10 AMP MOSFET
H-BRIDGE PWM MOTOR
DRIVER/AMPLIFIER
4224
The MSK 4224 is a complete H-Bridge circuit to be used for DC brushed motor control or Class D switchmode
amplification. All of the drive/control circuitry for the lowside and highside switches are internal to the circuit. The
250KHz PWM circuitry is internal as well, leaving the user to only provide an analog signal for the motor speed/
direction, or audio signal for switchmode audio amplification. The MSK 4224 is constructed on a space efficient
ceramic coated insulated metal substrate that can be directly connected to a heatsink.
DESCRIPTION:
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
1
2
3
4
5
6
7
8
9
HEN
Disable
N/C
Input
Ground
Ground
N/C
Vcc
Output A
Rev.- 06/98
1
FEATURES:
•Low RDS(ON) 0.020Ω Typical
•Low Cost Complete H-Bridge
•10 Amp Capability, 75 Volt Maximum Rating
•Self-contained Smart Lowside/Highside Drive Circuitry
•Internal 250KHz PWM Generation, Shoot-through Protection
•Isolated Case Allows Direct Heatsinking
•Four Quadrant Operation, Torque Control Capability
•Logic Level Disable Input
•Logic Level High Side Enable Input for Special Modulation or Function
Page 2
OUTPUT CHARACTERISTICS
RDS (ON) 4
VDS(ON) Voltage 1
Instantaneous Forward Voltage 1
Reverse Recovery Time 1
Leakage Current 1
PWM Frequency
Vcc SUPPLY CHARACTERISTICS
Quiescent Bias Current
Vcc Voltage Range 1
INPUT SIGNAL CHARACTERISTICS 1
Analog Input Voltage
Analog Input Voltage
Analog Input Voltage
LOGIC CONTROL INPUTS 1
SWITCHING CHARACTERISTICS 1
Rise-Time
Fall-Time
Dead-Time
V+ High Voltage Supply ..................................... 75V
VCC Logic Supply ................................................ 16V
IOUT Continuous Output Current ............................ 10A
IPK Peak Output Current ..................................... 20A
VOUT Output Voltage Range .... GND -2V min. to V + max.
θJC Thermal Resistance ................................ .5.3°C/W
(Output Switches)
ABSOLUTE MAXIMUM RATINGS
Each MOSFET ID=10A
Each MOSFET ID=10A 3
Each MOSFET IS=10A Intrinsic Diode 3
Intrinsic Diode
Each MOSFET V+=70V
Analog Input=6VDC
Output A,B=50% Duty Cycle
Output A=100% Duty Cycle High
Output B=100% Duty Cycle High
Input Voltage LO
Input Voltage HI
Input Current (DISABLE=0V)
Input Voltage LO
Input Voltage HI
Input Current (HEN=0V)
RL=100Ω
Parameter
ELECTRICAL SPECIFICATIONS
Units
Ω
V
V
nS
uA
KHz
mA
V
V
V
V
V
V
uA
V
V
uA
nS
nS
nS
Max.
0.013
TBD
TBD
280
25
275
TBD
16
-
-
-
0.8
-
-135
0.8
-
-270
-
-
-
MSK 4224
Typ.
-
TBD
TBD
-
1.0
250
43
12
6
4
8
-
-
-
-
-
-
TBD
TBD
100
Min.
-
-
-
-
-
225
-
9
-
-
-
-
2.7
-
-
2.7
-
-
-
-
Test Conditions 2
Rev.- 06/98
2
TST Storage Temperature Range .... -65C to +150°C
TLD Lead Temperature Range .................. .....300°C
(10 Seconds)
TC Case Operating Temperature
MSK4224 ........................ ....-25°C to +125°C
TJ Junction Temperature ................... .....+150°C
NOTES:
1 Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
2 Vcc=+12V unless otherwise specified.
3 Measure using a 300µS pulse with a 2% Duty Cycle.
4 On Resistance is specified for the Internal MOSFET for Thermal Calculations. It does not include the package pin resistance.
All Ratings: Tc= +25°C Unless Otherwise Specified
Disable Input
HEN Input
Page 3
APPLICATION NOTES
IN
VCC - Is the low voltage supply for powering internal
logic and drivers for the lowside and highside MOSFETS.
The supplies for the highside drivers are derived from
this voltage.
OUTPUT B - Is the output pin for the other half of the
bridge. Increasing the input voltage causes increasing
duty cycles at this output.
OUTPUT A - Is the output pin for one half of the bridge.
Decreasing the input voltage causes increasing duty
cycles at this output.
RSENSE A - Is the connection for the bottom of the A
half bridge. This can have a sense resistor connection
to the V+ return ground for current limit sensing, or
can be connected directly to ground. The maximum
voltage on this pin is ±2 volts with respect to GND.
RSENSE B - Is the connection for the bottom of the B
half bridge. This can have a sense resistor connection
to the V+ return ground for current limit sensing, or
can be connected directly to ground. The maximum
voltage on this pin is ±2 volts with respect to GND.
GND - Is the return connection for the input logic and
Vcc.
INPUT - Is an analog input for controlling the PWM
pulse width of the bridge. A voltage lower than Vcc/2
will produce greater than 50% duty cycle pulses out of
OUTPUT A. A voltage higher than Vcc/2 will produce
greater than 50% duty cycle pulses out of OUTPUT B.
DISABLE - Is the connection for disabling all 4 output
switches. DISABLE high overrides all other inputs.
When taken low, everything functions normally. An
internal pullup to Vcc will keep DISABLE high if left
unconnected.
HEN - Is the connection for enabling the high side out-
put switches. When taken low, HEN overrides other
inputs and the high side switches remain off. When
HEN is high everything functions normally. An internal
pullup to Vcc will keep HEN high if left unconnected.
This is a diagram of a typical application of the MSK4224.
The design Vcc voltage is +12 volts and should have a
good low ESR bypass capacitor such as a tantalum electro-
lytic. The analog input can be an analog speed control
voltage from a potentiometer, other analog circuitry or by
microprocessor and a D/A converter. This analog input gets
pulled by the current control circuitry in the proper direc-
tion to reduce the current flow in the bridge if it gets too
high. The gain of the current control amplifier will have to
be set to obtain the proper amount of current limiting re-
quired by the system.
Current sensing is done in this case by a 0.1 ohm sense
resistor to sense current from both legs of the bridge sepa-
rately. It is important to make the high current traces as big
as possible to keep inductance down. The storage capacitor
connected to the V+ and the module should be large enough
to provide the high energy pulse without the voltage sagging
too far. A low ESR ceramic capacitor or large polypropylene
capacitor will be required. Mount the capacitor as close to
the module as possible. The connection between GND and
the V+ return should not be carrying any motor current. The
sense resistor signal is common mode filtered as necessary
to feed the limiting circuitry for the microprocessor. This
application will allow full four quadrant torque control for a
closed loop servo system.
A snubber network is usually required, due to the induc-
tance in the power loop. It is important to design the snub-
ber network to suppress any positive spikes above 70V and
negative spikes below -2V with respect to ground.
V+ - Is the higher voltage H-bridge supply. The
MOSFETS obtain the drive current from this supply pin.
The voltage on this pin is limited by the drive IC. The
MOSFETS are rated at 75 volts. Proper by-passing to
GND with sufficient capacitance to suppress any volt-
age transients, and to ensure removing any drooping
during switching, should be done as close to the pins
of the module as possible.
MSK 4224 PIN DESCRIPTIONS TYPICAL SYSTEM OPERATION
Rev.- 06/98
3
Page 4
TYPICAL PERFORMANCE CURVES
Rev.- 06/98
4
Page 5
The information contained herein is believed to be accurate at the time of printing. MSK reserves the right to make
changes to its products or specifications without notice, however, and assumes no liability for the use of its products.
MECHANICAL SPECIFICATIONS
M.S. Kennedy Corp.
8170 Thompson Rd., Cicero, New York 13039-9393
Tel. (315) 699-9201
FAX (315) 699-8023
Screening Level
Part
Number
MSK4224
Industrial
ORDERING INFORMATION
NOTE: ALL DIMENSIONS ARE ±0.010 UNLESS OTHERWISE LABELED.
HOLE TORQUE SPECIFICATION: 5 TO 7 IN/LBS.
ESD Triangle Indicates Pin 1.
5
Rev.- 06/98
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